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JOHN H. FRENCH, or ALBANY, NEW YORK.-

Lemrs Patent No. 85,376, and December 29, 186s.

To all whom t't Inza/y concern: y

Beit known that I, JOHN H. FRENCH, of Albany, in the countyof Albany,and State of New York, have invented a new and improved School-Slate-Ruling Machine; and I do hereby declare that the following is a iiill,clear, and exact description thereof, which .will enable others skilledin the art to make and use thel same, reference being had to theaccompanying drawing, forming part of this specication, inwhich-f Figurel represents a plan or top view of my improved school-slate-rulingmachine.

Figures 2 and 3 are plan views of the same, showing it in differentpositions.

Figure 4 is a vertical longitudinal section of the same, taken ou theplane of the line x x, iig. 2.

' Figure 5 is a vertical transverse section of the same, taken ou theplane ofthe line y y, iig. 1.

Similar letters of reference indicate corresponding parts.

This invention relates to a new machine fonruling sehool-slates, of thatclass in which the lines are formed by scratching the surface of theslate with a pointe or sharp instrument.

The invention consists in the arrangement ofthe devices for adjustingthe slate and the tool-heads so that lines can he ruled longitudinally,transversely, ordiagonally across the slates, as may be desired.

Also, in the combination of the carriage-carrying the adjustable disk,in which spring-bearings are ar-v ranged with the tools. g

Also, in the application of stops, to arrest the motion of the slate ortool, whenever desired, so that certain kinds of lines may be stoppedbefore'they reach the end of the slate, ifso desired.

' A, inthe drawing, represents a stationary frame,

made of wood, iron, or other` suitable material, and.

having two parallel ways or rails, B B, upon which a carriage, G, can bemade to slide.

The sliding motion of the carliage can be produced by hand, or other"suitable mechanism, and canbe arrested by means of stops a a, which arearranged upon the rails BB,'as shown,'and which can be adjusted on thesame by means of set-screws b b.

Y In the carriage G is arranged a disk, D, which fits into a perforationin the top of the carriage, and which can be turned at will, and clampedin any desired position, by means of a spring-catch, c, titting into aperforation of the disk, as is shown more particularly in fl 4.

glu the disk is a rectangular orother perforation, as shown in iigs. 1,2, and 3, of such size as to allow the slate to pass through it.

The slate to be ruled is placed upon spring-supports, d d, which aresuspended from the disk D, and the slate has thus an elastic support,which allows it to be adjusted up and down at will.

vUnder the carri. e C is fitted, upon the frame A, a bar, block,' orhead, E, in which a sexies of rulingtools, F F, is clamped or set. Thetools are secured in the heads, the required distance apart, and thehead is fixed in the desired direction u'pon the fraine.-

Thus, in fig. 1, the head is set at iight angles to the line of motionof the carriage, and its tools are set as far apart as it is desired tohave the lines apart on the slate.

The'po'ints or tools Fare dat steel or other plates, ground to aZpointon one edge, as in fig. 5, and are fitted into the head E, in anysuitable.manneral4V though I prefer to have them clamped between twolongitudinal parts of the' head, with a piece of rubber, e, in front.The head may have slots to receive the shanks of the tools.

' The tools incline somewhat towards the rear, as in fig. 4, and are setwith their faces always at right angles to the line of motion, so thatthey may yield to the moving slate, whileif they were set with theiredge in front, or oblique, they `would be liable to be bent aside byinequalities in the surface of the slate, and crooked lines would thusbe produced. l

There should be a diffrent head, E, with its own set of tools, F, foreach set of lines to be drawn, so that for horizontal lines Ithe headwould be as in lig. 1; for vertical lines, as in tig. 2, in which latterthe tools are set a different distance apart; for diagoual lines, asing. 3, in which the tools are set at the requiredaugle to the face of thehead.

The disk D is turned in the carriage until the slate in it stands at therequired angle tov the line of motion; as, for expample, in iig. 2, thedisk is atright angles to its position in g. 1, so that when thecarriage is moved ou the rails, vertical lines will beproduced, whileiufig. 1, horizontal lines will be marked,

In tig.v 3, the disk is in still another position for the production ofdiagonal lines.

The angle of the diagonal lines may be varied at will, and for eachdifferent angle there should be another head, with tools, and a separateposition of the disk and head.

In operating, the slate is held down upon the teeth by theaidof apresser or pad, G, iig. 4. The heads are placed at the same angles tothe line of motion as is the disk, for the diii'erent sets of lines.Thus, for vertical and horizontal lines, the heads are at right anglesto the linefof motion, 'and-for oblique liies, the heads are at thevsame angle to the line of motion as is the side of the disk-perforationcorresponding to the 'topand bottom ofthe slate, as will be understoodby refcrence .to'tgs l and 3.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

. 1. Inserting the marking-tools F in their heads, at

BEBES 2 such an angle that their broad faces shall stand at 3. Theadjustable stops q, in combination with the right angles to the line ofmotion, whereby oblique sliding carriage C, turning disk D, andtool-head E, rulings are produced without changing the motion of :1,11made and operating substantially as herein shown the carriage, as hereinshown and described. :md described.

2. The carriage C, carrying the adjustable disk D, JOHN H, FRENCH, inwhich the spring-bearings (l d are arranged, in Witnesses: combinationwith the tools F F, tted in one 11e-ad, ALEX. E. RoBERTs,

substantially as set forth. J. M. GovINGToN.

